I get white pixels all over the rendered image
In the Properties window, Rendering tab, Sampling panel, you'll find the Clamp options. Try to change the Clamp Direct to 1 or to play with it a little bit.
EDIT: I just noticed there is a bulb (glass material). Maybe you'll have to play with the Clamp Indirect too.

Explanation of what happens:
These white pixels are called &quot;lucky rays&quot;. It happens in Cycles when you have many reflections. They are light rays that arrive to the camera in less bounces than the others, so their light is more powerful.
Playing with the clamp values you clamp the light to a value, so this rays are not so powerful anymore.